When people lose too much bone density as they age—or never reach peak bone density to begin with—they can develop a condition called osteoporosis. People with osteoporosis have what are called brittle bones and an increased risk of fractures. Anyone can get osteoporosis, but the following groups are most susceptible:

all women over age 50 (Women are four times more likely than men to develop osteoporosis.)
people with a small skeletal frame
Why do you think these groups have a high risk of osteoporosis?